Gentlebeings...
If you ever find yourself in desparate need of something out of the ordinary in balsa or basswood, I can honestly recommend you contact Superior Balsa:
Recalling my mis-spent youth building free flight (and later RC) airplanes I remembered that pre-shaped symetrical leading stock would be perfect. Except balsa would be too soft, prone to hanger rash and damage at touchdown.
Two emails and four days later, a box of 10 perfectly milled 3/8th symetrical BASSWOOD leading edges was on my door step this afternoon. AND, there are SEVEN additional pieces that they judged weren't perfect which they threw in at no charge ! The 'good' ones fit perfectly on the composite sandwich fin blanks, and even the 'bad' ones would have been acceptable with a little filler here and there.
Best of all...I was able to tell SWMBO "it was less than twenty dollars, Dear: :-)
It just doesn't get any better than this !
John